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They are frequently caught by border guards and deported. Nazario discusses the extent of security at the border. The INS has hired 5,600 additional agents since 1993 to staff the border. Some agents can track the footprints of migrants as they walk through the Texas desert. Others can tell how old the footprints are and in which directions the migrants are headed. Agents are paid to bring migrants in, and are given a bonus for catching them. They also insist that they actually work in the best interest of migrants, since migrants are too often wounded or killed by rattlesnake bites, train injuries, dehydration, or animals like coyotes and bobcats. In the depressing, difficult terrain, many migrants are thankful when apprehended.